<template>
    <div>
        <!-- 搜索页面头部 -->
        <div class="search-header">
            <!-- 后退按钮 -->
            <van-icon name="arrow-left" color="white" size="0.48rem" class="goback" @click="$router.back()"/>
            <!-- 搜索组件 -->
            <van-search
            v-fofo
            v-model.trim="kw"
            placeholder="请输入搜索关键词" background="#007BFF" shape="round"
            @input="inputFn"
            @search="searchFn"
            />
        </div>
        <!-- 搜索建议列表 -->
        <div class="sugg-list" v-if="kw.length !==0">
            <div class="sugg-item"
            v-for="(str,index) in suggestList" :key="index"
            v-html="lightFn(str,kw)"
            @click="suggestClickFn(str)">
            </div>
        </div>
        <!-- 搜索历史 -->
        <div class="search-history" v-else>
            <!-- 标题 -->
            <van-cell title="搜索历史">
                <!-- 使用 right-icon 插槽来自定义右侧图标 -->
                <template #right-icon>
                    <van-icon name="delete" class="search-icon"
                    @click="clearFn"/>
                </template>
            </van-cell>

            <!-- 历史列表 -->
            <div class="history-list">
                <span class="history-item"
                @click="historyClickFn(str)"
                v-for="(str,index) in history" :key="index">{{ str }}</span>
            </div>
        </div>
    </div>
  </template>

<script>
import { suggestListAPI } from '@/api'
import { getStorage, setStorage } from '@/utils/storage'
export default {
  name: 'SearchPage',
  data () {
    return {
      kw: '', // 搜索关键字
      timer: null,
      suggestList: [],
      // history: JSON.parse(localStorage.getItem('his')) || []// 搜索历史
      history: JSON.parse(getStorage('his')) || []// 搜索历史
    }
  },
  methods: {
    // 输入框 - 内容实时改变触发事件方法
    inputFn () {
      clearTimeout(this.timer)
      if (this.kw.length === 0) { this.suggestList = [] } else {
        this.timer = setTimeout(async () => {
          const res = await suggestListAPI({ keywords: this.kw })
          console.log(res)
          this.suggestList = res.data.data.options
        }, 300)
      }
    },
    // 专门处理字符串高亮关键字
    lightFn (originStr, target) {
      if (originStr !== null) {
        const reg = RegExp(target, 'ig')
        return originStr.replaceAll(reg, (match) => {
          return `<span style="color:red;">${target}</span>`
        })
      }
      return null
    },
    moveFn (theKw) {
      setTimeout(() => {
        this.$router.push({
          path: `/search_result/${theKw}`
        })
      }, 0)
    },
    // 输入框 - 搜索事件
    searchFn () {
    //   console.log('123')
      if (this.kw.length > 0) {
        this.history.push(this.kw)
        this.moveFn(this.kw)
      }
    },
    // 联想菜单-点击事件
    suggestClickFn (str) {
      this.history.push(str)
      this.moveFn(str)
    },
    // 历史记录-点击事件
    historyClickFn (str) {
      this.moveFn(str)
    },
    // 清除历史记录
    clearFn () {
      this.history = []
    }
  },
  watch: {
    history: {
      deep: true,
      handler () {
        const theSet = new Set(this.history)
        const arr = Array.from(theSet)
        // localStorage.setItem('his', JSON.stringify(arr))
        setStorage('his', JSON.stringify(arr))
      }
    }
  }
}
</script>

  <style scoped lang="less">
  .search-header {
    height: 46px;
    display: flex;
    align-items: center;
    background-color: #007bff;
    overflow: hidden;
    /*后退按钮*/
    .goback {
      padding-left: 14px;
    }
    /*搜索组件*/
    .van-search {
      flex: 1;
    }
  }
  /*搜索建议列表样式 */
.sugg-list {
  .sugg-item {
    padding: 0 15px;
    border-bottom: 1px solid #f8f8f8;
    font-size: 14px;
    line-height: 50px;
    // 实现省略号的三行代码
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}
/**搜索历史 */
.search-icon {
  font-size: 16px;
  line-height: inherit;
}

.history-list {
  padding: 0 10px;
  .history-item {
    display: inline-block;
    font-size: 12px;
    padding: 8px 14px;
    background-color: #efefef;
    margin: 10px 8px 0px 8px;
    border-radius: 10px;
  }
}
  </style>
